Actually every people who was born in this world divided at 3 kind to make it live - Body, Spirit, and Soul. Body were created from bone and meat united wrapped up by skin. It can be live cause of the Spirit blowed inside. All of the Spirit that exist in this universe then make dynamic moving and influenced each other in their dimension and the Soul to be created. The soul that made from dynamic spirit like that then created different personality or any human kind.

For simple good understand about Body, Spirit, and Soul you can take the computer system as analogize

Hardware = Body

Software = Soul

Spirit = Power Electricity

Now you've got the point. Because its important basic foundament of principal Primbon, Magic Spells, or another spiritual magic science.